Allow android_mallopt(M_SET_HEAP_TAGGING_LEVEL) to control scudo heap tagging.
The tag level may now be async, which is now the default. When the tag level
is set to none, memory tagging is disabled in the allocator using the new
API proposed in https://reviews.llvm.org/D70762 .
Bug: 135772972
Change-Id: I847f5822a70913c446ed9ffa13792177bbfc96af
diff --git a/libc/platform/bionic/malloc.h b/libc/platform/bionic/malloc.h
index 99eefa4..0ea7e3c 100644
--- a/libc/platform/bionic/malloc.h
+++ b/libc/platform/bionic/malloc.h
@@ -114,6 +114,8 @@
// Address-only tagging. Heap pointers have a non-zero tag in the most significant byte which is
// checked in free(). Memory accesses ignore the tag.
M_HEAP_TAGGING_LEVEL_TBI = 1,
+ // Enable heap tagging if supported, at a level appropriate for asynchronous memory tag checks.
+ M_HEAP_TAGGING_LEVEL_ASYNC = 2,
};
// Manipulates bionic-specific handling of memory allocation APIs such as